XMLparsing issue PHP

Im trying to parse the following XML :

  `<item><title><![CDATA[Van Gaal: Keep the faith]]></title><description><![CDATA[Manchester United manager Louis van Gaal is in a bullish mood ahead of Monday's trip to face West Brom in front of the Sky Sports cameras.]]>
   </description><link>http://ift.tt/11KFCrN;
   <guid isPermaLink="false">11661_9520895</guid>
   <pubDate>Fri, 17 Oct 2014 16:48:00 GMT</pubDate>
   <category>News Story</category>
   <enclosure type="image/jpg" url="http://ift.tt/11KFA36" length="123456" /></item>`

I am using the following code in my PHP script

$url = $xml->channel->attributes ()->items[$i]->enclosure->url;

But im not having much luck getting the url for the image. I have tried using the attribute() function, that didn't work.

Any suggestions would be gratefully appreciated .

Thanks